Stops soon after start

Tiny
ROB LUNSF
  • 1999 CHEVROLET TAHOE
  • 5.0L
  • V8
  • FWD
  • AUTOMATIC
  • 150,000 MILES

Car starts, shuts off, low gas to motor, new filter.
codes po171, po174, po420, po430,
where to go from here?

Do you
have the same problem?
Yes
No
Saturday, August 12th, 2017 AT 11:43 AM

1 Reply

Tiny
STEVE W.
  • EXPERT
  • 3,812 POSTS

What is the fuel pressure reading with the engine off?
Engine running?
What does the pressure do if you snap the throttle?
Check it over for vacuum leaks. Don't forget the brake booster.
What do the fuel trims show?
What do the O2 sensors read, both upstream and downstream?

Was this
answer
helpful?
Yes
No
Monday, August 14th, 2017 AT 3:11 PM

Please login or register to post a reply.

Recommended Guides